17990111011 has 4 divisors (see below), whose sum is σ = 18168231024. Its totient is φ = 17811991000.

The previous prime is 17990111003. The next prime is 17990111047. The reversal of 17990111011 is 11011109971.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 17990111011 - 2³ = 17990111003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17990111081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89059855 + ... + 89060056.

It is an arithmetic number, because the mean of its divisors is an integer number (4542057756).

Almost surely, 2^17990111011 is an apocalyptic number.

17990111011 is a deficient number, since it is larger than the sum of its proper divisors (178120013).

17990111011 is a wasteful number, since it uses less digits than its factorization.

17990111011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178120012.

The product of its (nonzero) digits is 567, while the sum is 31.

The spelling of 17990111011 in words is "seventeen billion, nine hundred ninety million, one hundred eleven thousand, eleven".